Tribological properties of a-CNx coatings sliding against SiC balls in ethylene glycol aqueous solution

Zhou, Fei, Yue, Bin, Wang, Qianzhi, Wang, Xiaolei, Koshi, Adachi and Kato, Koji (2010) Tribological properties of a-CNx coatings sliding against SiC balls in ethylene glycol aqueous solution. [in special issue: Some Current Trends in Improving Boundary Lubrication] Lubrication Science, 22 (6-7), 225-236. (doi:10.1002/ls.119).

Abstract

Amorphous carbon nitride(a-CNx) coatings were deposited on SiC disks by using ion beam assisted deposition, and their bonding structure and hardness were determined using X-ray photoelectron spectroscopy and nano-indenter, respectively. The contact angles on the surface of the a-CNx coatings were measured with contact angle meter. The friction and wear behaviours of the a-CNx/SiC tribopairs in ethylene glycol aqueous solution were investigated with ball-on-disk tribometer. The results indicated that the a-CNx coatings contained 12at. % nitrogen and their bonding structure consisted of sp2C=N/C=C and sp3C–N bonds. The static contact angles on the a-CNx coatings decreased with the ethylene glycol concentration. The lowest coefficient of friction of 0.019 was acquired as the ethylene glycol concentration was 10vol. %. When the ethylene glycol concentration increased, the specific wear rate of the SiC ball fluctuated in the range of 5.9 × 10?10?1.1 × 10?9?mm3?Nm?1, while that of a-CNx coatings varied in the range of 3.3 × 10?8?7.8 × 10?8?mm3?Nm?1.

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